Upsetting press and method for upsetting of an end of longitudinally extending workpieces

ABSTRACT

In order for upsetting presses to be able to work more effectively and in more energy-optimized manner for upsetting of an end of longitudinally extending workpieces, an upsetting press for upsetting of an end of longitudinally extending workpieces has at least two longitudinally divided dies, having at least two die parts. A first one of the two die parts is disposed on a first die revolver and a second one of the two die parts is disposed on a second die revolver.

CROSS REFERENCE TO RELATED APPLICATIONS

Applicant claims priority under 35 U.S.C. §119 of German ApplicationNos. 10 2014 004 540.4 and 10 2014 016 522.1 filed Mar. 31, 2014 andNov. 10, 2014, respectively, the disclosures of which are incorporatedby reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to an upsetting press for upsetting of an end oflongitudinally extending workpieces. The upsetting press has at leasttwo longitudinally divided dies, having at least two die parts. Theinvention also relates to a method for upsetting of an end oflongitudinally extending workpieces, which press has at least twolongitudinally divided dies, having at least two die parts.

2. Description of the Related Art

Corresponding upsetting presses and methods for upsetting of an end ofworkpieces that extend longitudinally are known, for example, from DE 3240 689 A1, from JP 60-3938 A, and from WO 2012/150564 A1.

In DE 32 40 689 A1, in particular, a charging apparatus for manipulationof tubes in an upsetting press having vertically divided dies isdescribed, wherein the dies comprise two engraved parts that lie one ontop of the other. To introduce a tube, the end of which is to bepre-upset, into the upper one of the engraved parts, the respective dieis opened, so that the tube can be moved into a gap between the two diehalves. Subsequently, the die halves close, and an upsetting operationcan be carried out. Afterward, the two die halves open again, and thepre-upset tube is moved into the lower one of the engraved parts forfinish-upsetting. A new tube can be moved into the upper one of theengraved parts again, for pre-upsetting.

The upsetting machine known from JP 60-3938 A comprises at least twodivisible dies, wherein two die halves of the divisible die can bemoved, in each instance, along two slanted slide surfaces of a dieframe, which surfaces are disposed conically relative to one another, toopen and close the divisible die. Closing and opening of the die takesplace using clamping cylinders disposed on the die frame. Thesecylinders are connected to interact with the two die halves of therespective divided die, by way of a suitably configured mechanism, sothat the two die halves can be moved translationally along the slidesurfaces.

In the upsetting press known from WO 2012/150564 A1, for upsetting of anend of a metal tube, dies provided for this purpose consist of two diehalves that can be moved relative to one another. These die halves aremounted in a rotation arm, in each instance, wherein these two rotationarms have a common articulation point. The die halves can be rotatedabout this common articulation point, so that the two die halves of thedies, in each instance, can be opened or closed.

In general, the known upsetting presses of the stated type often have anoverly large construction or they possess an opening and closingmechanism that is susceptible to breakdown or they are tootime-intensive with regard to opening and closing, in terms of theirfunction.

SUMMARY OF THE INVENTION

It is an object of the present invention to make available an upsettingpress and a method for upsetting of an end of longitudinally extendingworkpieces, which press and method work more effectively and in moreenergy-optimized manner.

These and other objects are accomplished by an upsetting press and by amethod for upsetting of an end of longitudinally extending workpieces,having the characteristics according to the invention. Furtherembodiments, which can be advantageous even independent of thesecharacteristics, are found below.

For example, an upsetting press for upsetting of an end oflongitudinally extending workpieces, which has at least twolongitudinally divided dies having at least two die parts, works moreeffectively and in more energy-optimized manner if a first one of thetwo die parts is disposed on a first die revolver and a second one ofthe two die parts is disposed on a second die revolver.

Because a first one of the two die parts is disposed on a first dierevolver and a second one of the two die parts is disposed on a seconddie revolver, an opening and closing mechanism for the die can bestructured with a very simple design and in extraordinarilyfailure-proof mariner, if suitably configured.

Furthermore, with a suitable configuration, the die parts, even ofmultiple dies, can be integrated within the upsetting press in anextremely tight construction space. As a result, it is possible tooperate the upsetting press equipped in this manner significantly moreeffectively.

Using the upsetting press or its dies, a plurality of differentlongitudinally extending workpieces can be machined at their ends. Forexample, these workpieces are tubes, rods or the like. Drill rodassemblies should be particularly emphasized in this connection, whichcan be machined or upset only on extremely large upsetting presseshaving correspondingly structured dies.

In this regard, the present invention specifically relates also tosuitably configured drill rod assembly upsetting presses, in other wordsto correspondingly designed large presses.

In this connection, the die preferably consists of two die halves thatcan be moved relative to one another. If configured accordingly,however, the die can also consist of multiple die parts of which a dieis then composed. In the latter case, in other words in the case ofmultiple die parts per die, multiple die revolvers can also be provided,but then, however, greater demands are made on a movement andapplication mechanism, with regard to the individual dies.

Furthermore, on the basis of the present advantageous design of therespective die, if suitably designed, can be opened and closed veryeasily in terms of process technology.

In this regard, a method for upsetting of an end of longitudinallyextending workpieces in an upsetting press, which has at least twolongitudinally divided dies, having at least two die parts, works moreeffectively and in more energy-optimized manner if the respective dieparts of the two dies are alternately displaced into an upsettingposition and into a readiness position.

It is advantageous if the respective alternately displaced die parts ofthe two dies are moved synchronously to one another, thereby making itpossible to open and close the individual dyes significantly morequickly.

This advantage relates not only to the die parts belonging to a die,which are rotated using at least two die revolvers, if applicable at thesame time, and to the die parts that are carried by the respective dierevolver and alternately displaced.

Particularly simple control can be achieved, in this connection, if twofirst die parts of the two dies and/or two second die parts of the twodies are simultaneously displaced, in each instance, between theupsetting position and the readiness position. Preferably, simultaneousdisplacement takes place with the identical path progression, in eachinstance, which can be implemented in particularly space-saving andstructurally simple manner.

An identical path progression, in this regard, can be implemented insimple manner in the present case if the two die parts are disposed on arigid body, for example on a die revolver, but separate control is alsoconceivable.

It is furthermore advantageous if the displacement between upsettingposition and readiness position takes place during a single heat andthat an upsetting procedure is carried out with each of the dies in theupsetting position. In this way, a multi-stage upsetting procedure thatis very effective in terms of energy is possible, which procedure drawsoptimal benefit from the rapid die change.

The description “during one or during a single heat” means, in the senseof the invention, that the workpiece does not need to be or is notreheated or repositioned between two upsetting procedures.

In this regard, repositioning of the workpiece out of a workpieceworking position, in particular, becomes superfluous. As a result, it ispossible to shorten the present upsetting method, on the one hand, andto carry it out in more energy-saving manner, on the other hand.

A method variant that leads further provides that the displacement takesplace by means of rotation of the die revolvers in the same directionand/or in opposite directions. In this connection, rotation as suchalready has the advantage that it can generally be carried out quicklyand operationally reliably, even in the case of heavy components, andtherefore also in the case of the heavy dies of a large press.

For example, in the case of a suitable design, rotation in the samedirection allows a very rapid change of two dies, the die parts of whichlie opposite one another, in each instance, because these die parts thenmove toward one another immediately or move away from one anotherimmediately.

Rotation in opposite directions, in contrast, in the case of a suitabledesign, allows engagement of respective projections into one another,which projections are formed by the die parts, for example, so thatthese projections can be moved past one another, whereby the latter, ifapplicable, particularly in the case of very complex die revolvers andin special cases, for example if three or more die parts are disposed ona die revolver, can also be made possible by means of displacement of atleast one of the die revolvers from a working position into anadjustment position, in which the die revolvers do not hinder oneanother.

Furthermore, it is advantageous if the two first die parts are disposedon the first die revolver and the two second die parts are disposed onthe second die revolver so as to open toward one another, in eachinstance. In this way, the two respective die parts that form a die canbe opened and closed in a simple design and quickly.

If each of the die parts of a die faces the other in an upsettingposition of the two die revolvers, which position belongs to this die,then each of the dies can be closed or opened in simple manner, in eachinstance.

A very advantageous embodiment variant provides that the longitudinaldivision of the dies takes place in a plane that does not intersect therotation axles of the respective die revolvers.

If the longitudinal division of the dies takes place in a plane thatdoes not intersect the rotation axles of the respective die revolvers,the working forces that occur at the respective die can be compensatedsignificantly better. In this regard, it is advantageous if the rotationaxle of the respective die revolver is disposed outside of a divisionplane formulated by the longitudinal division of this die revolver.

Furthermore, if the respective die part is disposed on the same side ofthe plane as the related rotation axle of the related die revolver, therisk that the die parts project outward so far that reciprocal hinderingof the die revolvers that lie directly next to one another takes placeduring a die change can be minimized. In this way, very operationallyreliable closing and opening of the dies, with a simple design, ispossible.

Both the design structure and the method management can be simplified,in the present case, if the two die revolvers are disposed on rotationaxles that are parallel to one another.

It is practical if at least one die part, in each instance, of a thirdlongitudinally divided die is disposed on the two die revolvers. In thisway, the advantage of a significantly faster and more precise die changeto a third die results, even if it possibly takes a little longer thanthe direct change between the first and the second die, or even if a diechange to this third die possibly can no longer take place during oneheat. It is understood that if necessary, further die parts of furtherlongitudinally divided dies can be provided on the die revolvers, ifthere is sufficient room for this purpose.

A corresponding die change can be implemented in structurally simplemanner if pairs of die parts that open toward one another are disposedon the two die revolvers, in each instance.

Furthermore, it is advantageous if at least one of the two, preferablyboth die revolvers can be displaced axially and/or radially between aworking position and an adjustment position. It is advantageous if, onthe one hand, the different dies can be disposed freely relative to oneanother in the adjustment position, if the die revolvers reciprocallyhinder one another in the working position and completely free rotationis not possible.

On the other hand, in a suitable design, free rotation, for example inthat—as in the case of gear wheels, for example—the projections causedby the respective die parts and the setbacks left between the die partsengage into one another, while the two die revolvers rotate in oppositedirections. This arrangement, however, seems to work only so long as noworkpiece is in its working position and rotation is thereby prevented.If necessary, an adjustment position is also practical for such a diechange.

In particularly in connection with large presses, it is advantageous ifthe upsetting press is in a reclining position and/or that a traverse,preferably a loose traverse of the upsetting press, passes through theworkpiece during pressing or in a pressing position.

The present upsetting press can advantageously be developed further ifthe upsetting press has a centered tube clamp preferably having at leastthree clamping jaws that can be braced relative to one another, whichare or can be particularly braced by way of a wedge bracing unit. Usingthis centered tube clamp, the longitudinally extending workpieces can bepositioned well, so that the two die parts that form a die canadvantageously be rotated along path curves, on both sides of alongitudinally extending workpiece, via the die revolvers.

These path curves preferably intersect in the region of the pressingposition or upsetting position.

It is understood that the characteristics of the solutions describedabove and in the claims can also be combined, if applicable, in order tobe able to implement the advantages cumulatively, accordingly.

BRIEF DESCRIPTION OF THE DRAWINGS

Further advantages, goals, and properties of the present invention willbe explained using the following description of exemplary embodiments,which are particularly shown also in the attached drawing. The drawingshows:

FIG. 1 is a schematic side view of an upsetting press having a first diepart belonging to a die, attached to a first die revolver, and having asecond die part belonging to this die, attached to a second dierevolver;

FIG. 2 is a schematic view of the arrangement according to FIG. 1, insection A-A of FIG. 1;

FIG. 3 shows a similar arrangement according to FIG. 1, of a furtherupsetting press, in a representation similar to that of FIG. 2; and

FIG. 4 shows a further upsetting press in a representation similar tothat of FIGS. 2 and 3.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

The upsetting press 1 shown as an example in FIGS. 1 and 2 is suitablefor upsetting of longitudinally extending workpieces 2, such as, forexample tubes 4 that embody a drill rod assembly 3.

The upsetting press 1 possesses a floor support unit 5 having transversesupport elements 7 (numbered only as an example) set into a ground 6, sothat the upsetting press 1 as a whole is firmly connected with thisground 6.

This floor support unit 5 in turn carries a fixed traverse 8, on the onehand, and a loose traverse 9, on the other hand, between which four tierods 10 (numbered only as an example), in total, are disposed. The fixedtraverse 8 and the loose traverse 9 are connected with one another bymeans of these tie rods 10, in this regard.

On the side 11 of the loose traverse 9, there is a centered tubeclamping unit 16 for clamping the longitudinally extending workpiece 2,which unit comprises three clamping jaws 17 that can be braced relativeto one another, which jaws in turn can be braced against thelongitudinally extending workpiece 2 by means of a wedge bracing device18. Large tubes 4 of drill rod assemblies 3 or the like, especially, canbe clamped and held in operationally reliable manner during theupsetting process, by means of the tube clamping unit 16.

Furthermore, a die arrangement 20, which comprises four longitudinallydivided dies 21 (see FIG. 2 as an example), in total, is situated on theside 11.

For opening or closing these dies 21, two die revolvers 22 and 23 areprovided on the die arrangement 20, wherein the first die revolver 22rotates about a first rotation axle 24 and the second die revolver 23rotates about a second rotation axle 25.

The two rotation axles 24 and 25 align with one another in thisexemplary embodiment, but the two rotation axles 24 and 25 can also bedisposed differently.

These two die revolvers 22 and 23 are driven by a drive motor 26, whichis connected to interact with the two die revolvers 22 and 23 or theirrotation axles 24 and 25 by means of a synchronization gear mechanism27, in such a manner that the two die revolvers 22 and 23 can rotateasynchronously or synchronously relative to one another, in order toopen or close the respective die 21 in the region (pressing position 45)of the longitudinally extending workpiece 2.

Each of the longitudinally divided dies 21 is composed, in eachinstance, of two upsetting shells (not specifically numbered) or dieparts 22.1 and 23.1 or 22.2 and 23.2 or 22.3 and 23.3 or 22.4 and 23.4,respectively (see FIG. 2), where the first die parts 22.1, 22.2, 22.3,and 22.4, in each instance, are configured by a rotation body (notspecifically numbered) of the first die revolver 22, and the second dieparts 23.1, 23.2, 23.3, and 23.4, in each instance, are configured bythe likewise rotation body of the second die revolver 23. In otherwords: The first of the four dies 21 of the die arrangement 20 iscomposed of a first die pair consisting of the die parts 22.1 and 23.1.Accordingly, the second of the four dies 21 of the die arrangement 20 iscomposed of a second die pair consisting of the die parts 22.2 and 23.2.The third of the four dies 21 of the die arrangement 20 is composed of athird die pair consisting of the die parts 22.3 and 23.3. And the fourthof the four dies 21 of the die arrangement 20 is composed of a fourthdie pair consisting of the die parts 22.4 and 23.4. Therefore, the firstdie part 22.1, 22.2, 22.3, and 22.4, in each instance, is disposed onthe first die revolver 22, and the second die part 23.1, 23.2, 23.3, and23.4, in each instance, is disposed on the second die revolver 23.

While essentially the die arrangement 20 with its components, the drivemotor 26, the longitudinally extending workpiece 2, and the tubeclamping unit 16 for it are now disposed on the first side 11, a dieframe arrangement 36 comprising at least one die frame 37 as well as dieframe cylinders 38 for it, and furthermore, a press mandrel 39 and apress cylinder unit 40 for it are disposed on the side 35 of the fixedtraverse 8.

The die frame 37 can be moved in the application direction 41, towardthe die arrangement 20, or back, by means of the die frame cylinders 38.

The die frame 37 holds the closed die 21, in each instance, which issituated in the pressing/upsetting position 45 (see FIG. 2), in eachinstance, in which die an end (2A) of the workpiece 2 situated in theworking position 46 is disposed, and encloses it in such a manner thatduring an upsetting procedure, the two respective die pairs remainfirmly connected with one another. In this regard, in this pressing orupsetting position 45, corresponding upsetting forces acting on the dieparts 22.1-23.1, 22.2-23.2, 22.3-23.3, or 22.4-23.4 are well absorbed bythe die frame 27, so that the die arrangement 20 is under less stress,accordingly.

The actual upsetting procedure takes place in known manner, by means ofthe press cylinder unit 40, which drives the press mandrel 39 throughthe die frame 37 all the way to the workpiece 2, which is situated inthe pressing position 45, and drives the die frame 37, together with thedie frame cylinders 38, in the application direction 41, in order toupset the end of the workpiece 2 that is clamped in the tube clampingunit 16. It is understood that here, in deviating embodiments, otherpressing sequences, particularly also without the pressing mandrel 39,are conceivable.

The components of the die frame arrangement 36 are mounted on alongitudinal guide traverse 47, so as to be displaceable relative to thecomponents of the die arrangement 20.

These die revolvers 22, 23 hold the four upsetting dies referred to asdies 21 in this exemplary embodiment, in each instance, as isparticularly evident in FIG. 2.

By rotating the die revolvers 22, 23 about their respective axle ofrotation 24 or 25, the upsetting shells or die parts 22.1, 22.2, 22.3,22.4 and 23.1, 23.2, 23.3, 23.4, being conveyed, in each instance, canbe brought together to form a closed die 21.

In this connection, the respective longitudinal division of the dies 21situated in the pressing or upsetting position 45, in each instance,takes place in a plane 50, which does not intersect the rotation axles24 and 25 of the respective die revolvers 22 and 23.

Furthermore, the respective die part 22.1, 22.2, 22.3, 22.4 of the firstdie revolver 22, situated in the pressing position or starting position46, is disposed on a first side 51 of the plane 50, on which therotation axle 24 of the first die revolver 22 is situated. Accordingly,the respective die part 23.1, 23.2, 23.3, 23.4 situated in the pressingposition 45 is situated on a second side 52, namely the same side of theplane 50 on which the related rotation axle 25 of the related dierevolver 23 is disposed.

Because of the opposite placement of the die parts 22.1-22.2, 22.3-22.4or 23.1-23.2, 23.3-23.4, opening toward one another, in each instance,the tube center of the tube 4 to be upset is not intersected during thechange from the first upsetting procedure to the second upsettingprocedure. In this way, double upsetting during one heat is easilypossible, in advantageous manner.

To change between the individual dies 21, the die revolvers 22 and 23are rotated in the same direction about the respective rotation axle 24or 25.

By means of rotation of the die revolvers 22, 23 in opposite directions,a change between the two dies 21 formed by the die parts 22.1, 23.1 and22.2-23.2 and the two dies 21 formed by the die parts 22.3, 23.3 and22.4, 23.4 can take place, but this change is then only possible withouta workpiece 2 or in a corresponding adjustment position, because theprojections of the die revolver 22, 23, which carry the die parts 22.1,22.2, 22.3, 22.4, 23.1, 23.2, 23.3, 23.4, engaging into one another likegear wheels, must be guided past one another and past the position inwhich the workpiece is clamped.

In this connection, corresponding control of the die revolvers 22 and 23must be observed, so that these die revolvers do not undesirably touchone another during a rotation.

If this control is not possible in an embodiment, or if a die changebetween the dies 21 is to take place, while a tube 4 is already situatedin its working position 46, the die revolvers 22 and 23 can also bedisplaced, if necessary, in the case of a corresponding design of thedie arrangement 20, into an adjustment position (not shown here), wherethen, for example, at least one of the die revolvers 22 or 23 is axiallydisplaceable in the direction of the rotation axle 24 or 25. Ifnecessary, this expedient can also be achieved using an overalldisplacement of one of the rotation axles 24 or 25.

In this connection, it is also possible, in the case of a correspondingdesign, that both die revolvers 22 and 23 or both rotation axles 24 and25 are mounted so as to be axially displaceable in the longitudinalexpanse of the upsetting press, similar to the die frame with regard tothe application direction 41, or vice versa.

While the two die parts 22.1 and 23.1 are already in the pressingposition or upsetting position 45 (see die part 23.1) or just ahead ofit (see die part 22.1) in FIG. 2, for forming or closing a die 21, theremaining die parts 22.2, 22.3, 22.4 and 23.2, 23.3, 23.4 are disposedin the readiness positions 53 (numbered only as an example). In thisway, a very rapid die change takes place.

The further alternative upsetting press 101 shown in FIG. 3 and in across-sectional representation has essentially the same structure—withthe exception of the other first and second die revolvers 122 and 123—asthe upsetting press 1 shown in FIGS. 1 and 2, so that with regard to thedesign and the function, reference is made to the above description, inorder to avoid repetition. In this regard, the same reference symbolsare used for the same components.

The two die revolvers 122 and 123 also possess rotation bodies (notnumbered specifically) here, but these rotation bodies form or carryonly two die parts 122.1 and 122.2 or 123.1 and 123.2, in each instance.In this connection, the die parts 122.1, 123.1 and 122.2, 123.2 can forma die 121 once again, by means of suitable rotation of the die revolvers122 and 123, in the pressing position or upsetting position 45, in eachinstance. In this exemplary embodiment, however, corresponding controlof the die revolvers 122 and 123 must be observed, so that these dierevolvers do not undesirably touch one another during a rotation. Thedie parts 122.1 and 122.2 as well as 123.1 and 123.2 are characterized,in each instance, by an opposite arrangement, in which they open towardone another. In this connection, the two rotation axles 24 and 25 of thetwo die revolvers 122 and 123 lie vertically one on top of the other andnot horizontally next to one another.

Similar to the upsetting presses 1 and 101 shown in FIGS. 1, 2, and 3,the further upsetting press 201 shown in FIG. 4, in a cross-sectionalrepresentation, is characterized by essentially the samestructure—except for first and second die revolvers 222 and 223 whichare configured differently once again. In this regard, reference is madeto the above description.

In this connection, the die revolvers 222 and 223 carry or configure twodie parts 222.1 and 222.2 or 223.1 and 223.2, in each instance, butthese die revolvers 222 and 223 are structured with rotation symmetry,thereby resulting in more complex control of the two die revolvers 222and 223 with regard to opening and closing of the dies 221 (onlynumbered as an example), and a die change is not possible during oneheat or only in an adjustment position in which the die revolvers 222,223 are displaced and then rotated accordingly. Also, the die revolvers222, 223, which actually have a very simple structure, cannot be simplyrotated synchronously, but rather must be controlled in complex manner,in order to be able to perform a die change, unless they are separatedfrom one another by way of at least one adjustment position, so thatthey can rotate independent of one another.

In this exemplary embodiment, as well, the die parts 222.1 223.1 and222.2, 223.2 again form a die 221, in each instance, by means ofsuitable rotation of the die revolvers 222 and 223 in the pressingposition or upsetting position 45.

The adjustment position can be defined, for example, by means of anaxial displacement of both or only one of the die revolvers 22, 23, 122,123, 222, 223. Likewise, the adjustment position can be defined, ifapplicable, in that the rotation axles 24, 25 are displaced radially, inother words perpendicular to their expanse, particularly in order toprevent engagement of the die revolvers 22, 23, 122, 123, 222, 223 intoone another during the rotation. If more complex rotational movementsare possible, it is possible to eliminate a separate adjustmentposition.

The upsetting presses 1, 101, and 201 shown in FIGS. 1 to 4 all serveparticularly for upsetting of ends of drill rod assemblies. In thisregard, these upsetting presses 1, 101, and 201 can preferably also beviewed specifically as drill rod assembly upsetting presses.

It is understood that the exemplary embodiments described above aremerely first embodiments of the upsetting press 1, 101 or 201 accordingto the invention. In this regard, the embodiment of the invention is notrestricted to these exemplary embodiments.

Thus, although only a few embodiments of the present invention have beenshown and described, it is to be understood that many changes andmodifications may be made thereunto without departing from the spiritand scope of the invention.

What is claimed is:
 1. An upsetting press for upsetting of an end of alongitudinally extending workpiece, comprising: (a) at least first andsecond longitudinally divided dies, each die having at least first andsecond die parts; and (b) a first die revolver and a second dierevolver; wherein each of the first die parts are disposed on the firstdie revolver and each of the second die parts are disposed on the seconddie revolver.
 2. The upsetting press according to claim 1, wherein thefirst die parts are disposed on the first die revolver and the seconddie parts are disposed on the second die revolver so as to open towardone another, in each instance.
 3. The upsetting press according to claim1, wherein the first die part of the first die faces the second die partof the first die in an upsetting position of the first die revolver andthe first die part of the second die faces the second die part of thesecond die in an upsetting position of the second die revolver.
 4. Theupsetting press according to claim 1, wherein the dies arelongitudinally divided in a plane that does not intersect first andsecond rotation axles of the respective first and second die revolvers.5. The upsetting press according to claim 4, wherein each of the firstdie parts is disposed on a first side of the plane where the firstrotation axle of the first die revolver is disposed and each of thesecond die parts is disposed on a second side of the plane where thesecond rotation axle of the second die revolver is disposed.
 6. Theupsetting press according to claim 1, wherein the first and second dierevolvers are disposed on rotation axles that are parallel to oneanother.
 7. The upsetting press according to claim 1, wherein at least afirst die part of a third longitudinally divided die is disposed on thefirst die revolver and at least a second die part of the thirdlongitudinally divided die is disposed on the second die revolver. 8.The upsetting press according to claim 7, wherein the first and seconddie parts are disposed in pairs that open toward one another, in eachinstance, on the first and second die revolvers.
 9. The upsetting pressaccording to claim 1, wherein at least the first die revolver isdisplaceable in at least one of an axial direction and a radialdirection between a working position and an adjustment position.
 10. Theupsetting press according to claim 1, wherein both the first and seconddie revolvers are displaceable in at least one of an axial direction anda radial direction between a working position and an adjustmentposition.
 11. An upsetting method for upsetting of an end of alongitudinally extending workpiece in an upsetting press comprising atleast first and second longitudinally divided dies, each die having atleast first and second die parts, said method comprising: (a) disposingthe workpiece in the upsetting press; and (b) alternately displacing thefirst and second die parts of the first and second longitudinallydivided dies into an upsetting position and into a readiness position.12. The upsetting method according to claim 11, wherein the first dieparts of the first and second longitudinally divided dies or the seconddie parts of the first and second longitudinally divided dies aredisplaced simultaneously, in each instance, between the upsettingposition and the readiness position.
 13. The upsetting method accordingto claim 12, wherein both the first and second die parts of the firstand second longitudinally divided dies are displaced simultaneouslybetween the upsetting position and the readiness position.
 14. Theupsetting method according to claim 12, wherein displacement takes placewith an identical path progression, in each instance.
 15. The upsettingmethod according to claim 11, wherein displacement between the upsettingposition and the readiness position takes place during one heat, and anupsetting procedure is carried out with each of the first and secondlongitudinally divided dies in the upsetting position.
 16. The upsettingmethod according to claim 11, wherein displacement takes place by atleast one of rotation in a same direction and rotation in an oppositedirection of the first and second die revolvers.
 17. The upsettingmethod according to claim 11, wherein the upsetting press is in areclining position or wherein a traverse passes through the workpieceduring pressing or in a pressing position.
 18. The method according toclaim 17, wherein the traverse is a loose traverse of the upsettingpress.
 19. The upsetting press according to claim 1, further comprisinga centered tube clamp having at least three clamping jaws that can bebraced relative to one another, and a wedge bracing unit for bracing theat least three clamping jaws relative to one another.